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# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2016-2024, by Samuel Williams.
# Copyright, 2021, by Khaled Hassan Hussein.
require 'strscan'
require_relative 'parse_error'
require_relative 'sort'
module HTTP
module Accept
module Languages
# https://tools.ietf.org/html/rfc3066#section-2.1
LOCALE = /\*|[A-Z]{1,8}(-[A-Z0-9]{1,8})*/i
# https://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.9
QVALUE = /0(\.[0-9]{0,6})?|1(\.[0]{0,6})?/
# https://greenbytes.de/tech/webdav/rfc7231.html#quality.values
LANGUAGE_RANGE = /(?<locale>#{LOCALE})(\s*;\s*q=(?<q>#{QVALUE}))?/
# Provides an efficient data-structure for matching the Accept-Languages header to set of available locales according to https://tools.ietf.org/html/rfc7231#section-5.3.5 and https://tools.ietf.org/html/rfc4647#section-2.3
class Locales
def self.expand(locale, into)
parts = locale.split('-')
while parts.size > 0
key = parts.join('-')
into[key] ||= locale
parts.pop
end
end
def initialize(names)
@names = names
@patterns = {}
@names.each{|name| self.class.expand(name, @patterns)}
self.freeze
end
def freeze
@names.freeze
@patterns.freeze
super
end
def each(&block)
return to_enum unless block_given?
@names.each(&block)
end
attr :names
attr :patterns
# Returns the intersection of others retaining order.
def & languages
languages.collect{|language_range| @patterns[language_range.locale]}.compact
end
def include? locale_name
@patterns.include? locale_name
end
def join(*args)
@names.join(*args)
end
def + others
self.class.new(@names + others.to_a)
end
def to_a
@names
end
end
LanguageRange = Struct.new(:locale, :q) do
def quality_factor
(q || 1.0).to_f
end
def self.parse(scanner)
return to_enum(:parse, scanner) unless block_given?
while scanner.scan(LANGUAGE_RANGE)
yield self.new(scanner[:locale], scanner[:q])
# Are there more?
break unless scanner.scan(/\s*,\s*/)
end
raise ParseError.new("Could not parse entire string!") unless scanner.eos?
end
end
def self.parse(text)
scanner = StringScanner.new(text)
languages = LanguageRange.parse(scanner)
return Sort.by_quality_factor(languages)
end
end
end
end
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